IB Physics Glossary



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Q

Quality factor

$$Q$$, is a measure of the ionization strength of various radioactive source.

Radiation type
Q
$$\alpha$$
20
Fast neutrons
10
Slow neutrons
3
Fast protons
1
$$\beta, \gamma$$, X-rays
1

Quantum efficieny

is the ratio of emitted electrons to incident photons falling on a pixel.
Increasing the quantum efficiency makes the CCD more sensitive to light.

Quasar

is a quasi-stellar radio source. A compact region in the center of a black hole. (d)